Originally designed to only track winter losses, the survey began tracking summer (and therefore total annual) loss rates in the year spanning 2010 - 2011. (sciencedaily.com)
Now for the first time, information about winter losses from a large - scale survey carried out from 2010 - 13 has been published. (sciencedaily.com)
The chart tracks winter losses in the U.S. in the past decade, as well as annual losses since 2010 - 2011. (discovermagazine.com)